Boa constrictor is a non-venomous Boaspecies.[1] The snake can be found in Central and South America, and on some islands in the Caribbean. The common name is the same as the scientific name, which is unusual. The color pattern of its skin can vary considerably. Boa constrictors grow to a large size. Currently, there are ten subspecies, including the one that gives the name (called nominate subspecies).[2]

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The size adult animals reach varies among subspecies. The largest animals have been found in Northern south America. Two animals from Suriname are currently the largest on record: One reached 411cm (13.5 ft), the other 427cm (a bit over 14 ft). Such sizes are rare, boas reaching 3m are considered large.[3] There is a report of a boa reaching 5.6m in Trinidad, but it is believed that snake was an anaconda,Eunectes murinus, taken for a boa.[4]

Boas can use their tail to grasp things. This is known as prehensility. Boas do not have organs that react to warmth around the mouth.[5]

Boas have a color pattern that is brownish, and becomes brick red around the tail. Dorsally, the ground color is overlaid with a series of large tan-colored saddles that become lighter towards the tail. Here, the saddles break up into half rings of a pale cream color in vivid contrast with the red.[6]

Small individuals may climb into trees and shrubs to forage, but they become mostly terrestrial as they become older and heavier.[3] It is said that specimens from Central America are more irascible, hissing loudly and striking repeatedly when disturbed, while those from South America tame down more readily.[8]

This species does well in captivity, usually becoming quite tame. It is a common sight in zoos. Captive longevity is 20 to 30 years, with rare accounts of over 40 years, making them a long-term commitment as a pet. Proper animal husbandry is the most significant factor in captive lifespan. Though still exported from their native South America in significant numbers, it is widely bred in captivity.